I've had the privelidge of visiting two WW II subs. The USS Cobia in Mantiwoc, Wisconsin and the USS Ling in Hackensack, New Jersey. A friend of mine by the name of Jerry Calenberg did some volunteer work on the Cobia and kindly gave my sons and a guided tour of the sub a few years back. By the end of the tour, my sons were asking more questions than I was.
I still have a bunch of pictures from the USS Ling that I took. If anybody is interested I can post some of them here.